As you could see, I have a 94 Ranger 4x4 with the good ol 4.0. My question is how much should I lift the front for it to be level. Or in other words, how much more is the rear raised than the front. So if I wanted to raise the rear 3", how much should I raise the front so its level.

 

It depends on how much your springs have sagged, so Break out the tape measure. Measure ground to wheel well on all four corners and compare. That will tell you how much rake you have.